New love new tank

Hello everyone,
Always loved them, always wanted one, never knew anything about them
except they were cool.
My lovely wife and I went on honeymoon in the Tahitian islands for 3
weeks and snorkeled everyday. When we got back to Atlanta we missed
the underwater views we saw everyday. So much that we had to get a
marine mini reef set up. The tank is my first, but I think after
reading most of the book I bought along with everything I needed minus
fish, the dealer hooked me up with the right stuff. Live rocks, live
sand, protien skimmer ect. The water has been in the tank for one week.
The specific gravity is perfect, the temp is 73 f and Im starting to
get a layer of brown splotches on everything? The book didn't mention
the brown algae? whatever it is doesn't look great. How long do I have
to wait to introduce specimens? When do I know it has cycled? Please
help.......